package com.shiro.demo.utils;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;

import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

public class HttpUtil {
    static final Logger log = org.slf4j.LoggerFactory.getLogger(HttpUtil.class);

    public static Integer getIntegerValueFromRequest(HttpServletRequest request, String key) {
        String value = request.getParameter(key);
        Integer returnValue = null;
        if (StringUtils.isNotBlank(value)) {
            try {
                returnValue = Integer.parseInt(value);
            } catch (Exception e) {
            }
        }

        return returnValue;
    }

    public static Long getLongValueFromRequest(HttpServletRequest request, String key) {
        String value = request.getParameter(key);
        Long returnValue = null;
        if (StringUtils.isNotBlank(value)) {
            try {
                returnValue = Long.parseLong(value);
            } catch (Exception e) {
            }
        }
        return returnValue;
    }

    public static String getStringValueFromRequest(HttpServletRequest request, String key) {
        String value = request.getParameter(key);
        String returnValue = null;
        if (StringUtils.isNotBlank(value)) {
            try {
                returnValue = String.valueOf(value);
            } catch (Exception e) {
            }
        }
        return returnValue;
    }

    public static Integer getIntegerValueHasDefaultFromRequest(HttpServletRequest request, String key,
                                                               int defaultValue) {
        String value = request.getParameter(key);
        Integer returnValue = null;

        if (StringUtils.isBlank(value)) {
            return defaultValue;
        }

        if (StringUtils.isNotBlank(value)) {
            try {
                returnValue = Integer.parseInt(value);
            } catch (Exception e) {
                return defaultValue;
            }
        }
        return returnValue;
    }

    /**
     *
     * 中文转码
     *
     *
     *
     * @param request
     *
     * @param key
     *
     * @return
     *
     */
    public static String getURLDecoderValueFromRequest(HttpServletRequest request, String key) {
        String value = request.getParameter(key);
        String returnValue = null;

        if (StringUtils.isNotBlank(value)) {
            try {
                returnValue = URLDecoder.decode(URLDecoder.decode(value, "UTF-8"), "UTF-8");
            } catch (Exception e) {
            }
        }
        return returnValue;
    }

    /**
     * 时间转换
     *
     * @param request
     * @param key
     * @return
     */
    public static Date getDateValueFromRequest(HttpServletRequest request, String key) {
        String value = request.getParameter(key);
        Date returnValue = null;
        if (StringUtils.isNotBlank(value)) {
            try {
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                returnValue = sdf.parse(value);
            } catch (Exception e) {
            }
        }
        return returnValue;
    }

    /**
     * 返回上一个访问的页面
     *
     * @param request
     * @return
     */
    public static String getHttpReferer(HttpServletRequest request) {
        return request.getHeader("Referer");
    }

    public static String getIpAddress(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        if (StringUtils.isBlank(ip) || StringUtils.equalsIgnoreCase(ip, "unknown")) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ip) || StringUtils.equalsIgnoreCase(ip, "unknown")) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (StringUtils.isBlank(ip) || StringUtils.equalsIgnoreCase(ip, "unknown")) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        if (StringUtils.isBlank(ip) || StringUtils.equalsIgnoreCase(ip, "unknown")) {
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");
        }
        if (StringUtils.isBlank(ip) || StringUtils.equalsIgnoreCase(ip, "unknown")) {
            ip = request.getRemoteAddr();
        }
        if (StringUtils.isNotBlank(ip) && StringUtils.indexOf(ip, ",") > 0) {
            String[] ipArray = StringUtils.split(ip, ",");
            ip = ipArray[0];
        }
        return ip;
    }

    /**
     * 向指定URL发送GET方法的请求
     *
     * @param url
     *            发送请求的URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            // for (String key : map.keySet()) {
            // System.out.println(key + "--->" + map.get(key));
            // }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                log.error(e2.getMessage(), e2);
            }
        }
        return result;
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url
     *            发送请求的 URL
     * @param param
     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            URLConnection conn = realUrl.openConnection();
            // 设置通用的请求属性
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 获取URLConnection对象对应的输出流
            out = new PrintWriter(conn.getOutputStream());
            // 发送请求参数
            out.print(param);
            // flush输出流的缓冲
            out.flush();
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送 POST 请求出现异常！" + e);
        }
        // 使用finally块来关闭输出流、输入流
        finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                log.error(ex.getMessage(), ex);
            }
        }
        return result;
    }
}
